This depends on the company's articles.
Quorum for directors' meetings
11. (1) At a directors' meeting, unless a quorum is participating, no proposal is to be voted on, except a proposal to call another meeting.
(2) The quorum for directors' meetings may be fixed from time to time by a decision of the directors, but it must never be less than two, and unless otherwise fixed it is two.
(3) If the total number of directors for the time being is less than the quorum required, the directors must not take any decision other than a decision-
(a) to appoint further directors, or
(b) to call a general meeting so as to enable the shareholders to appoint further directors.
Art. 89. The quorum for the transaction of the business of the directors shall be fixed by the directors and unless so fixed shall be two. A person who holds office only as an alternate director shall, if his appointor is not present, be counted in the quorum.
Art. 90. The continuing directors or a sole continuing director may act notwithstanding any vacancies in their number, but if the number of directors is less than the number fixed as the quorum, the continuing directors or director may act only for the purpose of filling vacancies or of calling a general meeting.
Note that a private company may have just one director. Many private companies have the following provision:
Whenever the minimum number of directors is one, a sole director shall have authority to exercise all the powers and discretions vested in the directors generally, and Article 89 of Table A (which relates to the quorum at board meetings) is modified accordingly.
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